钦-杭结合带硅质岩的分布特征及其地质意义  

A study of the distribution characteristics of siliceous rocks in Qinzhou(Bay)-Hangzhou(Bay)Joint Belt and its geological significances

作　　者：李红中[1,2,3,4] 周永章[4,5] 杨志军[4,5] 高乐[4,5] 何俊国[4,5] 梁锦[4,5] 曾长育[4,5] 吕文超[4,5] 

机构地区：[1]广东省公路勘察规划设计院股份有限公司,广东广州510507 [2]中国科学院地质与地球物理研究所 [3]中国科学院矿产资源研究重点实验室,北京100029 [4]广东省地质过程与矿产资源探查重点实验室,广东广州510275 [5]中山大学地球科学与地质工程学院,广东广州510275

出　　处：《地学前缘》2015年第2期108-117,共10页Earth Science Frontiers

基　　金：国家自然科学基金项目(41303025;41273040);中国地质调查局地质矿产调查评价专项项目(1212010071012)

摘　　要：钦州—杭州（钦-杭）结合带位于中国东南部地区,跨越浙江、江西、湖南、广东和广西5省（区）。大致以南岭为界,该带可划分为北、中、南三段。中段与南岭带重合,大致分布在北纬24°~27°范围,以北为北段,包括江西、浙江及安徽南部,以南为南段,包括粤西桂东南地区。钦-杭结合带跨带内沉积硅质岩广泛发育,地质和地球化学证据展示它们主要为热水成因。硅质岩相关的热水活动分布偏向于靠近结合带的两侧。钦-杭结合带＂北、中、南＂三段的硅质岩时空分布存在明显差异：南段及两侧邻区大规模热水活动集中于晚古生代,中段及两侧邻区的集中于早古生代,北段及邻区的热水活动集中于元古宙。这种大规模热水活动自北向南逐渐变新的特点与钦-杭结合带分段演化具有较好的对应关系。作为热水活动地质遗迹的硅质岩,其形成与大地构造与地球动力学背景的演化有密切的关系,特别是与钦-杭结合带的几个拉张阶段存在较好的对应关系。富含硅质的热水活动伴随了丰富的成矿作用,热水喷流沉积型块状硫化物矿床和热水沉积型金矿在该构造带内均较为典型。The Qinzhou （Bay）-Hangzhou （Bay） Joint Belt （QHJB）, located in the Southeast of China, runs across the Zhejiang, Jiangxi, Hunan, Guangdong and Guangxi Provinces, and is divided into north, middle and south segments with the demarcation of the Nanling tectonic zone. The middle segment of the QHJB is located primarily in the Nanling tectonic zone, which lies between latitudes 24° and 27° north approximately. Separated by the middle segment, the other two segments are north segment including provinces of Jiangxi and Zhejiang and Northern Anhui province and south segment including west Guangdong and Southeast Guangxi provinces. The siliceous rocks are widely distributed in the QHJB, especially on the both sides of the QHJB, whose geological and geochemical characteristics denote the hydrothermal genesis. The hydrothermal siliceous rocks were earlier distributed on a large scale next to the northern segment and then developed in the middle and then in the south. This phenomenon is in accordance with the distinct tectonic evolution in the three segments. It can be accounted for by a large scale hydrothermal activity in the south segment during the Neopaleozoic, and a large scale hydrothermal activity in the middle and north segments during the Eopaleozoic and the Proterozoic, respectively. The siliceous rocks represent the old hydrothermal activities and were distributed closely to the tectonic evolution and dynamics background during the tensional phases. In the QHJB, there is a wide distribution of SEDEX type sulfide deposits and hydrothermal sedimentary gold ore deposits, which indicates the abundant metallogenesis during the hydrothermal activities.

关 键 词：钦-杭结合带 硅质岩 热水活动 分段 成矿作用 

分 类 号：P588.24[天文地球—岩石学]